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United States Patent |
6,078,553
|
Niioka
,   et al.
|
June 20, 2000
|
Disc cartridge loading and unloading apparatus with shutter opening
structure
Abstract
A disc device including a floating base supported by a chassis through a
plurality of elastic members, a holder which is supported on the floating
base so as to be able to move vertically with respect to the floating
base, and into which a disc cartridge is inserted, a slider, slidably
disposed so as to move in directions of inserting and discharging a disc
cartridge into and out of the disc device, for holding and carrying a disc
cartridge inserted thereinto, and a switch lever, pivotably supported on
the holder, for detecting that a disc cartridge is inserted correctly. A
shutter opener slidably is disposed on the holder so as to be able to
slide in directions of inserting and discharging the disc cartridge into
and out of the holder, the shutter opener having a pair of grooves
engaging pins fixed to said holder, the shutter opener having a projecting
portion for opening a shutter of the disc cartridge carried by the slider.
Inventors:
|
Niioka; Takayuki (Tokyo, JP);
Fujiwara; Tatsunori (Tokyo, JP);
Morimoto; Takao (Tokyo, JP);
Asai; Shigeki (Tokyo, JP)
|
Assignee:
|
Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
|
Appl. No.:
|
040382 |
Filed:
|
March 18, 1998 |
Foreign Application Priority Data
Current U.S. Class: |
720/644 |
Intern'l Class: |
G11B 033/02 |
Field of Search: |
369/75.1,75.2,77.1,77.2,291
360/96.5,99.02,99.06,133
|
References Cited
U.S. Patent Documents
5014151 | May., 1991 | Tsukasa et al | 360/133.
|
5481423 | Jan., 1996 | Aoki | 369/77.
|
5537377 | Jul., 1996 | Takai et al. | 369/75.
|
Foreign Patent Documents |
0539199 | Apr., 1993 | EP.
| |
0684603 | Nov., 1995 | EP.
| |
5-174478 | Jul., 1993 | JP.
| |
Primary Examiner: Letscher; George J.
Parent Case Text
This application is a divisional of copending application Ser. No.
08/676,485, filed on Jul. 8, 1996, the entire contents of which are hereby
incorporated by reference.
Claims
What is claimed is:
1. A disc device comprising:
a floating base supported by a chassis through a plurality of elastic
members;
a holder supported on said floating base so as to be able to move
vertically with respect to said floating base;
a slider, slidably disposed in said holder so as to move in directions of
inserting and discharging a disc cartridge into and out of said holder,
for holding and carrying the disc cartridge inserted thereinto; and
a shutter opener slidably disposed on said holder so as to be able to slide
in directions of inserting and discharging the disc cartridge into and out
of said holder, said shutter opener having a pair of grooves engaging pins
fixed to said holder, said shutter opener having a projecting portion for
opening a shutter of the disc cartridge carried by said slider,
said projecting portion including a hook portion disposed on a longitudinal
side of said shutter opener wherein said hook portion opens the shutter.
2. The disc device according to claim 1,
said holder including a groove engaging said hook portion.
3. The disc device according to claim 2,
said groove including a side wall for terminating the slidable movement of
said shutter opener by abutting with said hook portion at a stopping point
of the shutter opening operation.
4. The disc device according to claim 1,
said hook portion having a substantially U-shaped profile.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a disc device such as a
motor-vehicle-mounted disc device for playing back a mini disc.
2. Description of the Prior Art
Recent years have seen advances in the area of reducing the physical size
of such a disc device since mini-disc players were brought out. However,
further downsizing of a motor-vehicle-mounted disc device has been
required.
Conventionally, as disclosed in Japanese Patent Application Laid Open
(KOKAI) No.5-174478, for example, a cartridge inserting and discharging
mechanism for a mini-disc player is so constructed that, when carrying a
mini-disc to its replay position, a cartridge holder carrier provided with
a rack plate, which is driven by rotation of a power motor, carries a
cartridge holder with the disc, and the engagement of a locking axis (or a
locking pin) of a supporting base (or a floating base) with an axis
engaging groove (or a pin engaging groove) is released. Then, the
supporting base becomes a floating state, and the mini disc is played
back.
Such a prior art disc device used as motor-vehicle-mounted equipment
suffers from a disadvantage that when a disc cartridge is inserted
incorrectly, the device suffers a failure since it cannot detect wrong
insertion of disc cartridges.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a disc device
which can detect wrong insertion of disc cartridges.
In accordance with the present invention, there is provided a disc device
including: a floating base supported by a chassis through a plurality of
elastic members; a holder supported on the floating base so as to be able
to move vertically with respect to the floating base; a slider, slidably
disposed in the holder so as to move in directions of inserting and
discharging a disc cartridge into and out of the holder, for holding and
carrying a disc cartridge inserted thereinto; and a switch lever,
pivotably supported on the holder, for detecting that a disc cartridge is
inserted correctly.
The slider comprises a wrong-insertion preventing lug projecting inwardly
from the slider, which can be engaged in a groove formed on one edge of a
disc cartridge when the disc cartridge is inserted into the holder.
Furthermore, the switch lever has a free end portion which is positioned
outside a free end part of the wrong-insertion preventing lug.
In accordance with a preferred embodiment of the present invention, the
disc device further includes a shutter opener disposed on the holder so as
to be able to slide in directions of inserting and discharging the disc
cartridge into and out of the holder, the shutter opening having a
projecting portion for opening a shutter of the disc cartridge carried by
the slider.
Furthermore, the disc device includes a holder arm rotatably supported on
the floating base. The holder is rotatably engaged with the holder arm.
When replaying a disc cartridge held in the holder, the disc cartridge
which is being held in the holder is loaded onto the floating base by
rotating the holder with respect to the holder arm and rotating the holder
arm with respect to the floating base.
The holder arm includes a first pin fixed thereon and penetrating the
holder arm, one end of the first pin being inserted into a hole of the
floating base, and the floating base includes a second pin fixed thereon
and inserted into a hole of the holder arm. The holder arm is rotatably
supported on the floating base by means of the first and second pins.
The holder includes a pair of projecting portions and the holder arm
comprises a pair of notch portions each having a circle-shaped notch in
which each of the pair of projecting portions of the holder is engaged.
The holder is incorporated into the holder arm such that the holder is
rotatably supported by the holder arm, by inserting the pair of projecting
portions of the holder into the pair of circle-shaped notches of the
holder arm and then rotating the holder with respect to the holder arm.
Further scope of applicability of the present invention will become
apparent from the detailed description given hereinafter. However, it
should be understood that the detailed description and specific examples,
while indicating preferred embodiments of the invention, are given by way
of illustration only, since various changes and modifications within the
spirit and scope of the invention will become apparent to those skilled in
the art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will become more fully understood from the detailed
description given hereinbelow and the accompanying drawings which are
given by way of illustration only, and, thus, are not limitative of the
present invention, and wherein:
FIG. 1 is a perspective view of a disc device according to the present
invention;
FIG. 2a is a general top plan view showing a cartridge inserting and
discharging mechanism of a disc device according to a first embodiment of
the present invention;
FIG. 2b is a general side view showing the cartridge inserting and
discharging mechanism shown in FIG. 2a;
FIG. 2c is a general side view showing the cartridge inserting and
discharging mechanism in a state wherein a holder is moved down toward a
floating base;
FIGS. 3a is a top view showing the assembly of a holder arm and the holder
of the disc device of the first embodiment;
FIGS. 3b is a side view showing the assembly of the holder arm and holder
of the disc device of the first embodiment;
FIG. 4 is a perspective view showing the assembly of the holder arm and
floating base of the disc device of the first embodiment;
FIG. 5 is a general top view of the disc device of the first embodiment in
a state wherein a disc cartridge is inserted into the holder;
FIG. 6 is a general top view of the disc device of the first embodiment in
a state wherein the disc cartridge inserted is carried to the playback
position;
FIG. 7 is a general top view of the disc device of the first embodiment in
a state wherein an ejector arm is separate from a slider disposed within
the holder;
FIGS. 8a and 8b are a top view and a side view of a shutter opener slidably
disposed on the holder of the disc device of the first embodiment,
respectively;
FIGS. 9a and 9b are a top view and a side view of the slider slidably
disposed within the holder of the disc device of the first embodiment,
respectively;
FIG. 10 is a plan view showing the ejector arm, a spacer arm, and power
motor start and stop switches of the disc device of the first embodiment;
FIGS. 11a and 11b are a plan view and a side view of a cartridge insertion
detecting member of the disc device of the first embodiment, respectively;
FIG. 12 is a general plan view showing the disc device of the first
embodiment in a state wherein a disc cartridge is correctly inserted into
the slider;
FIG. 13 is a general plan view showing the disc device of the first
embodiment in a state wherein a disc cartridge is correctly inserted into
the slider and the cartridge is further carried into the holder;
FIG. 14 is a general plan view showing the disc device of the first
embodiment in a state wherein a disc cartridge is incorrectly inserted
into the slider;
FIG. 15 is a general plan view showing the disc device of the first
embodiment in a state wherein a disc cartridge is incorrectly inserted
into the slider and the cartridge is further carried into the holder;
FIG. 16 is a general top view showing of the disc device of the first
embodiment in a state wherein the floating base is locked;
FIG. 17 is a left side view of the disc device when viewed from the
direction indicated by the arrow L in FIG. 16;
FIG. 18 is a partially cutaway view of the left side view of FIG. 17;
FIG. 19 is a right side view of the disc device when viewed from the
direction indicated by the arrow R in FIG. 16;
FIG. 20 is a plan view showing a slide plate and a locking plate which are
integral parts of the floating base locking mechanism of the first
embodiment;
FIG. 21 is an elevational view of the slide plate shown in FIG. 20;
FIG. 22 is an elevational view of the locking arm shown in FIG. 20;
FIG. 23 is a plan view showing another slide plate and another locking arm
which are integral parts of the floating base locking mechanism of the
first embodiment;
FIG. 24 is an elevational view of the other slide plate;
FIG. 25 is an elevational view of the other locking arm;
FIG. 26 is a graph showing a load imposed on a rotary cam when locking and
unlocking the floating base;
FIG. 27 is a general top view showing the disc device of the first
embodiment in a state wherein the floating base is unlocked and the holder
is moved down toward the floating base;
FIG. 28 is a left side view of the disc device when viewed from the
direction indicated by the arrow L in FIG. 27;
FIG. 29 is a partially cutaway view of the left side view of FIG. 28;
FIG. 30 is a right side view of the disc device when viewed from the
direction indicated by the arrow R in FIG. 27;
FIG. 31 is a bottom view showing the floating base on which a pickup is
disposed;
FIG. 32 is a side view of the floating base shown in FIG. 31;
FIG. 33 is a plan view showing peripheral components of a power motor of
the disc device of the first embodiment;
FIG. 34 is a side view showing the disc device of the first embodiment when
the upper part of the holder is pushed downwards;
FIG. 35 is a rear view showing the slider provided with a pair of
protrusions when viewed from the upper side of FIG. 5;
FIG. 36 is a rear view showing a pair of slider hooks provided with a pair
of protrusions when viewed from the upper side of FIG. 5;
FIG. 37 is a side view showing a spring engaged between the floating base
and the holder arm;
FIG. 38 is a plan view showing the ejector arm, groove portion of the
slider, and a bent portion of one of the pair of slider hooks;
FIG. 39 is an enlarged view showing the bent portion shown in FIG. 38;
FIG. 40 is a plan view showing a state wherein the pin of the ejector arm
is brought into contact with the bent portion of the slider hook;
FIG. 41 is a plan view showing a state wherein the pin of the ejector arm
is engaged in the groove portion of the slider;
FIG. 42 is a plan view showing a state wherein the pin of the ejector arm
is guided by a guide portion and then is brought into contact with the
bent portion of the slider hook;
FIG. 43 is an enlarged view showing the guide portion shown in FIG. 42;
FIG. 44 is a rear view showing the slider of a disc device according to a
second embodiment of the present invention;
FIG. 45 is a plan view partially showing the slider shown in FIG. 44;
FIG. 46 is a general plan view of a disc device according to a third
embodiment of the present invention;
FIG. 47 is a left side view of the disc device when viewed from the
direction indicated by the arrow L in FIG. 46;
FIG. 48 is a right side view of the disc device when viewed from the
direction indicated by the arrow R in FIG. 46;
FIG. 49 is a partially cutaway view of FIG. 48;
FIG. 50 is a plan view showing first and second slide plates and a link
plate which are integral parts of the floating base locking mechanism
according to the third embodiment as shown in FIG. 49;
FIG. 51 shows an elevational view of the first slide plate shown in FIG.
50;
FIG. 52 shows an elevational view of the link plate shown in FIG. 50; and
FIG. 53 is an elevational view of the second slide plate shown in FIG. 50.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Next, a description will be made as to a disc device according to an
embodiment of the present invention.
Roughly speaking, the disc device can be divided into four mechanisms as
follows. The first mechanism is a disc cartridge inserting and discharging
mechanism. The second mechanism is a floating base locking mechanism for
locking and unlocking a floating base. The third mechanism is a pickup
moving mechanism. The fourth mechanism is a power motor peripheral
mechanism.
Next, the description will be directed to the basic operation of the disc
device. First, the disc cartridge inserting and discharging mechanism
carries a disc cartridge into its playback position where the cartridge
can be loaded onto the floating base. Then, the floating base locking
mechanism unlocks the floating base, so that a chassis holds the floating
base by means of a vibration-absorbing mechanism. As a result, it is
difficult for vibrations from outside to reach the floating base. Next,
the disc device starts to play back the disc loaded on the floating base.
During the playback of the disc, the pickup moving mechanism moves the
pickup in the radial direction of the disc. When the playback of the disc
is completed, the floating base locking mechanism locks the floating base,
and then the disc cartridge inserting and discharging mechanism discharges
the disc cartridge out of the disc device. Finally, the operation is
finished. The power motor is a drive source which serves to drive the disc
cartridge inserting and discharging mechanism and floating base locking
mechanism.
The basic operation of the disc device is as described above. Next, a
detailed description will be made of the structure and operation of each
of the four mechanisms.
Referring now to FIG. 1, it illustrates a perspective view showing an
outward appearance of a disc device according to the present invention.
When a disc cartridge is inserted into the disc device through an
insertion opening 110, if the user pushes a play start button or pushes
the disc cartridge into a predetermined position, the disc cartridge
inserting and discharging mechanism causes the power motor 56 to drive an
ejector arm 9 so as to carry the disc cartridge to the playback position.
Furthermore, when the user pushes an discharge button (or eject button),
the disc cartridge inserting and discharging mechanism carries the disc
cartridge from the playback position to a position where the user can take
out the disc cartridge easily.
Referring now to FIGS. 2a and 2b, they respectively illustrate a top view
and a side view of the disc cartridge inserting and discharging mechanism
constructed from a holder arm 1, a side arm 2, a holder 7 and the floating
base 21 which are accommodated within the chassis 24. Furthermore, FIG. 2c
is a side view showing a state in which the disc cartridge held in the
holder 7 is loaded on the floating base 21 together with the holder 7 so
that the disc can be played back. FIGS. 3a and 3b show a top view and a
side view showing the assembly of the holder arm 1 and holder 7,
respectively.
In FIGS. 2b and 2c, reference numeral la denotes a notch portion disposed
in a lower side part of the U-shaped holder arm 1, 1d denotes a
circle-shaped notch formed in the notch portion, and 1c denotes a stopping
portion projecting from a side surface of the holder arm 1. The stopping
portion of the holder arm is adapted to abut on the side arm 2 so as to
stop the movement of the side arm relative to the holder arm. The side arm
2 is arranged outside the holder arm 1 and in parallel with the side
surface of the holder arm 1. Furthermore, 2a denotes an inclined portion
projecting from a side surface of the side arm 2 and having an inclined
surface which can be brought into contact with a slide plate 37 (see FIGS.
11a and 11b), slidably attached on the chassis 24, when the floating base
21 is locked.
In addition, reference numeral 3 denotes a pin which is fixed at the holder
arm 1 and is penetrating the side arm 2. The side arm 2 is rotatably
supported by the pin 3. Reference numeral 4 denotes a projecting portion
projecting, which is formed by cutting and bending, from the side arm 2,
and 5 denotes a projecting portion, which is formed by cutting and
bending, projecting from the holder arm 1. The projecting portions 4 and 5
are engaged with the arm portions 6a and 6b of a spring 6, respectively.
For example, a twisting spring is used as the spring 6. The holder arm 1
and side arm 2 can rotate about the pin 3. Therefore, the arm portion 6b
of the spring 6 urges the projecting portion 5 in the direction indicated
by the arrow A1 in FIG. 2b and the arm portion 6a of the spring 6 urges
the projecting portion 4 in the direction indicated by the arrow A2 in
FIG. 2b. Simultaneously, the stopping portion 1c of the holder arm 1
arrests the rotational movement of the side arm 2 relative to the holder
arm 1.
Reference numeral 7a denotes a pair of projecting portions formed on both
side surfaces of the box-shaped holder 7 as shown in FIG. 3a. The cross
section of each of the pair of projecting portions 7a is shaped such that
its thickness in the direction of inserting a cartridge, i.e., the
horizontal thickness is larger than the vertical width. That is, the
projecting portion 7a is shaped like a plate and the holder 7 is arranged
such that the longitudinal side of the projecting portion is in parallel
with the direction of inserting a disc cartridge into the holder, in this
case, the longitudinal side of the projecting portion is running
horizontally. The upper surface of the holder 7 in the vicinity of the
insertion opening 110, as shown in FIG. 1, through which a disc cartridge
is inserted is indicated by reference numeral 7a.
Next, a description will be made as to the assembly of the holder arm 1 and
holder 7. First, the holder 7 is inserted into the holder arm 1 in the
direction indicated by the arrow B so that the projecting portion 7a fits
into the notch portion 1a, as shown in FIG. 3b. After the pair of
projecting portions 7a are fitted into the pair of circle-shaped notches
1d of the notch portions 1a, the holder 7 is rotated in the direction
indicated by the arrow C. Then, the pair of projecting portions 7a are
engaged in the pair of notch portions 1a, as shown in FIG. 2b. Thus, once
the assembly is completed, the holder arm 1 can rotate with respect to the
holder 7 since the pair of projecting portions 7a can pivot within the
pair of circle-shaped notches 1d. As will be mentioned later, since the
holder 7 does not rotate with respect to the holder arm 1 until the pair
of projecting portions 7a of the holder reach their inserting position
where they have been inserted into the pair of notch portions 1a, the
holder 7 and holder arm 1 cannot separate from each other. The width of
the opening of each of the pair of circle-shaped notches 1d in the pair of
notch portions 1a of the holder arm 1 is smaller than the longitudinal
thickness of each of the pair of projecting portions 7a of the holder 7.
Therefore, the pair of projecting portions 7a cannot fall off the pair of
circle-shaped notches 1d. Furthermore, since the pair of projecting
portions 7a are formed on both of the side surfaces of the holder 7, the
provision of the pair of projecting portions 7a does not increase the
vertical size of the holder 7.
As shown in FIG. 2a, a pin 23 which is engaged with the holder arm 1 is
disposed at one side surface of the floating base 21 on which a cartridge
inserted into the holder 7 can be loaded when replaying the disc in the
cartridge. Furthermore, the floating base 21 is provided with supporting
axes 74, 75 and 76 supported by elastic members 105, 106 and so on as
shown in FIG. 1.
Referring now to FIG. 4, it illustrates the assembly of the holder arm 1
and floating base 21. The pin 3 is integrally disposed on the holder arm 1
and the pin 23 is integrally disposed on the floating base 21. In order to
mount the holder arm 1 on the floating base 21, first, the pin 23 is
inserted into a corresponding hole 1b of the holder arm 1. Then, an
inner-side pin of the pin 3 is inserted into a corresponding hole 21b of
the floating base 21. Thus, incorporating the floating base 21 into the
holder arm 1 is completed. The pins 3 and 23 serve as rotational axes.
Therefore, the holder arm 1 can rotate with respect to the floating base
21. Furthermore, the pins 3 and 23 also serve as locking pins for securing
the floating base 21 to the chassis 24 when no cartridge is loaded on the
floating base 21.
Referring now to FIGS. 5, 6, and 7, they respectively illustrate a general
top view showing the disc device in a state wherein a disc cartridge is
inserted into the holder 7, a general top view showing the disc device in
a state wherein the disc cartridge is carried to the playback position,
and a general top view showing the disc device in a state wherein the
ejector arm 9 is separate from a slider 14 disposed within the holder 7.
In these figures, only main components are illustrated. In FIG. 7, the
holder 7 is omitted. Furthermore, in these figures, reference numeral 11
denotes a shutter opener, 8 denotes a hook disposed on one edge of the
shutter opener 11 for opening the shutter of a disc cartridge inserted,
and 10 denotes a groove portion disposed on the slider 14. The cross
section of the groove portion is shaped like a letter U.
Referring now to FIGS. 8a and 8b, they respectively illustrate a top view
and a side view showing the detail of the shutter opener 11 slidably
disposed on the holder 7. As shown in these figures, the shutter opener 11
is provided with grooves 11a and 11b engaged with pins 12 and 13, as shown
in FIG. 5, disposed on the upper surface of the holder 7. As will be
mentioned later, as a disc cartridge inserted moves, the shutter opener 11
slides on the holder 7 while being guided by the pins 12 and 13. The hook
8 moves within a groove 73 of the holder during the sliding movement of
the shutter opener and then comes into contact with a side wall 73a of the
groove 73 at the stop position of the shutter opener. Then, the shutter
opener 11 stops.
Referring now to FIGS. 9a and 9b, they respectively illustrate a top view
and a side view showing the detail of the slider 14 slidably disposed
within the holder 7. The slider 14 is provided with holes 150, 160, and
170 into which pins 15, 16, and 17 shown in FIGS. 5 and 6 are fitted. The
slider 14 is supported within the holder 7 by means of the pins 15, 16,
and 17 and is engaged with the holder 7 so that the slider can slide along
guide grooves 18 and 19, formed on the upper surface of the holder 7, in
the direction of inserting and discharging the disc cartridge. A pin 20
(see FIG. 5) disposed on one end part of the ejector arm 9 is adapted to
slide within the groove portion 10 of the slider 14. Furthermore, there is
provided a pair of slider hooks 69, each of which is constructed of an
elastic body such as a plate spring, and which are fixed on the rear side
surface of the slider 14 for holding a disc cartridge inserted into the
slider. Bent portions 69a of the slider hooks 69 protrude inwardly so as
to be engaged with the guide grooves of the disc cartridge inserted.
In FIGS. 5 to 7, reference numeral 25 denotes a spacer arm, 26 denotes an
axis about which the ejector arm 9 and spacer arm 25 can rotate, 27
denotes a projecting portion, which is formed by cutting and bending,
projecting from the spacer arm 25, 28 denotes a projecting portion, which
is formed by cutting and bending, projecting from the ejector arm 9, and
29 denotes a spring, arm portions 29a and 29b of which are respectively
engaged with the projecting portion 28 of the ejector arm 9 and projecting
portion 27 of the spacer arm 25. The arm portions 29a and 29b of the
spring 29 urge the projecting portions 27 and 28 in the directions
indicated by the arrows D1 and D2 shown in FIG. 5, respectively.
When the ejector arm 9 and spacer arm 25 abut on each other at contact
portions 9a and 25a thereof, they stop relatively. Thus, since they cannot
further rotate until the angle between the arms 9 and 25 becomes larger
than a predetermined angle, the minimum width of a driving gap (or a
driving groove) 79 formed between the ejector arm 9 and the spacer arm 25
is ensured.
Furthermore, reference numeral 78 denotes a pin disposed on a rotary cam
55. As the rotary cam 55 rotates about an axis 77 in the direction
indicated by the arrow V shown in FIG. 5, the pin 78 slides along the
driving gap 79 constructed by the ejector arm 9 and spacer arm 25. The
driving gap 79 is formed such that the pin 78 is loosely engaged in the
gap 79 while the pin 20 is engaged in the groove portion of the slider 14,
as shown in FIGS. 5 and 6. As previously mentioned, the arm portions 29a
and 29b of the spring 29 urge the projecting portions 27 and 28 in the
directions indicated by the arrows D1 and D2 shown in FIG. 5,
respectively. Furthermore, the driving gap 79 is formed such that the
width of the driving gap 79 at an end-of-travel point 79a as shown in FIG.
7 becomes narrower than the diameter of the pin 78 due to the urging force
of the spring 29. As a result, the ejector arm 9 and spacer arm 25
securely holds the pin 78 of the rotary cam 55 through the gap 79 while
the pin 20 of the ejector arm 9 is separate from the groove portion of the
slider 14. Therefore, the ejector arm 9 and spacer arm 25 are securely
connected to the rotary cam 55 via the pin 78, and hence they do not
rattle.
Furthermore, reference numeral 67 denotes a twisting reversal spring which,
when a disc cartridge is inserted into the slider 14 within the holder 7,
as shown in FIG. 5, urges the slider 14 in the direction indicated by the
arrow U so that the slider 14 abuts on a side wall of the holder 7 in the
vicinity of the insertion opening.
Referring now to FIG. 10, it illustrates a plan view showing a relationship
between the ejector arm 9 and spacer arm 25 and switches 32 and 34. In
cases where a disc cartridge can be inserted into the holder, the ejector
arm 9 is positioned such that one end part 31 of the ejector arm 9 is
brought into contact with the power motor start switch 32. In addition, on
end part 33 of the spacer arm 25 abuts on the power motor stop switch 34.
The power motor start switch 32 is adapted to be turned on when there
occurs a change from the state in which it is pushed by the end part 31 of
the ejector arm 9 to the state in which it is free of the pressure by the
end part. That is, when the ejector arm 9 in the state shown in FIG. 10
rotates in the direction indicated by the arrow P in order to carry a disc
cartridge inserted, the power motor start switch 32 is switched on. Thus,
when a disc cartridge is slightly inserted into the slider by the user and
then the ejector arm 9 rotates slightly, the power motor start switch 32
is switched on with result that the power motor 56 is started. The power
motor stop switch 34 is adapted to stop the power motor 56 when it is
pushed by the end part 33 of the spacer arm 25. That is, when the ejector
arm 9 rotates in the direction indicated by the arrow Q in order to
discharge the disc cartridge and then reaches the state as shown in FIG.
10, the power motor stop switch 34 is switched on so as to stop the power
motor 56.
Next, a description will be made as to a mechanism for preventing wrong
insertion of a disc cartridge. FIGS. 11a and 11b respectively show a plan
view and a side view of a cartridge insertion detecting member. FIGS. 12
and 13 are plan views showing the holder in the state wherein a disc
cartridge is correctly inserted. FIGS. 14 and 15 are plan views showing
the holder in the state wherein a disc cartridge incorrectly oriented is
inserted. In these figures, reference numeral 70 denotes a switch lever
disposed as the cartridge insertion detecting member which can pivot in
the direction indicated by the arrow K in FIG. 12 and then can abut on a
switch not shown in the figure, 71 denotes a contact portion of the
cartridge insertion detecting member 70, which can come into contact with
a disc cartridge inserted, 72 denotes a pin about which the cartridge
insertion detecting member 70 can pivot, an 720 denotes a hole formed in
the cartridge insertion detecting member 70, which the pin 72 penetrates.
Furthermore, reference numeral 74 denotes a wrong-insertion preventing lug
formed in the slider 14 for preventing wrong insertions. As shown in FIG.
13, when a disc cartridge normally oriented is inserted into the holder 7,
the wrong-insertion prevention lug 74 is fitted into the groove 75 of the
disc cartridge inserted. The switch lever 70 is pivotably attached on the
holder 7 and is located behind and outside the end part of the
wrong-insertion preventing lug 74, when viewed from the insertion opening
through which a disc cartridge is inserted, so that the contact portion 71
projecting from the switch lever 70 can be brought into contact with a
corner of the disc cartridge inserted correctly.
As shown in FIGS. 11a and 11b, the contact portion 71 of the cartridge
insertion detecting member 70 is bent such that it easily comes into
contact with the left side corner of the front of a disc cartridge
inserted. Since the wrong-insertion preventing lug 74 is fitted into the
groove 75 when a disc cartridge is correctly inserted in the direction
indicated by the arrow W, the contact portion 71 of the cartridge
insertion detecting member 70 is brought into contact with the cartridge
and then pivots about the pin 72 in the direction indicated by the arrow
K, as shown in FIGS. 12 and 13. As a result, the cartridge detection
switch is switched on.
On the contrary, as shown in FIGS. 14 and 15, when a disc cartridge, which
is turned 90 degrees and is therefore oriented incorrectly, is inserted
into the holder 7 by mistake, the wrong-insertion preventing lug 74 is
brought into contact with a side edge of the disc cartridge having no
groove into which the wrong-insertion preventing lug 74 can be fitted. The
inserted disc cartridge cannot move on the left side within the slider 14
because the wrong-insertion preventing lug 74 obstructs the cartridge.
Therefore, when a disc cartridge oriented incorrectly is inserted, the
disc cartridge cannot pull toward the cartridge insertion detecting member
70. As a result, since the end portion 71 cannot be brought into contact
with a corner of the disc cartridge inserted and hence the cartridge
insertion detecting member 70 cannot rotate, the detection switch is not
switched on. Since the power motor 56 is not activated unless the
detection switch is switched on, such a wrong-orientation insertion of a
disc cartridge does not cause the next disc cartridge inserting operation.
Next, the description will be directed to the floating base locking
mechanism. FIG. 16 shows a general top view of the disc device in a state
wherein the floating base is locked by the floating base locking
mechanism, FIG. 17 shows a left side view of the disc device when viewed
from the direction indicated by the arrow L in FIG. 16, FIG. 18 shows a
partially cutaway view showing the inside of the chassis shown in FIG. 17,
and FIG. 19 shows a right side view of the disc device when viewed from
the direction indicated by the arrow R in FIG. 16. FIG. 20 shows a plan
view showing a slide plate 37 and a locking arm 35 which are integral
parts of the floating base locking mechanism, FIG. 21 shows an elevational
view of the slide plate 37, and FIG. 22 shows an elevational view of the
locking arm 35. Furthermore, FIG. 23 shows a plan view showing a slide
plate 50 and a locking arm 49 which are integral parts of the floating
base locking mechanism, FIG. 24 shows an elevational view of the slide
plate 50, and FIG. 25 shows an elevational view of the locking arm 49.
In FIG. 16, reference numeral 84 denotes a link which rotates about an axis
87 as the rotary cam 55 rotates, one end part 88 of the link 84 being
engaged with the slide plate 37, 85 denotes a pin fixed on the link 84 and
engaged with a groove 86 formed in the rotary cam 55, 95 denotes a link
which rotates about an axis 150 as the rotary cam 55 rotates, one end part
151 of the link 95 being engaged with the slide plate 50, and 96 denotes a
pin fixed on the link 95 and engaged with a groove 97 formed in the rotary
cam 55.
The locking arm 35 is adapted to rotate about an axis 36 disposed as a
supporting axis which penetrates a hole in one side wall of the chassis
24, as shown in FIG. 17. The slide plate 37 is provided with bent portions
41 and 42 (see FIGS. 20 and 21) which are slidably engaged with grooves 38
and 39 formed in the side wall of the chassis 24, respectively. Therefore,
the slide plate 37 can slide forward and backward in the direction
indicated by the arrow G and vice versa with respect to the chassis 24.
For example, when the rotary cam 55 in the state as shown in FIG. 16
rotates in the clockwise direction, the pin 85 moves along the groove 86
and hence the slide plate 37 slides in the direction indicated by the
arrow G with respect to the chassis 24. While the disc device is in the
state as shown in FIGS. 16 to 18, the slide plate 37 is locking the
floating base 21 by securing the pins 3 and 94 by means of locking grooves
91 and 92. Furthermore, a spring 45 connected between the bent portion 43
of the slide plate 37 and a projecting portion 44 of the chassis 24, which
is formed by cutting and bending, urges the slide plate 37 in the
direction of locking the floating base 21 (the direction indicated by the
arrow T in FIG. 17).
Furthermore, reference numeral 89 denotes a L-shaped groove formed on the
slide plate 37, and 90 denotes a pin which is fixed on the locking arm 35
and is engaged in the groove 89. Thus, the locking arm 35 rotates about
the axis 36 as the slide plate 37 slides.
As shown in FIGS. 19 and 24, the other slide plate 50 disposed on the
opposite side of the floating base 21 is also provided with bent portions
52 and 251 which are slidably engaged with grooves 51 and 250 formed in
another side wall of the chassis 24, respectively. Thus, the slide plate
50 can slide forward and backward with respect to the chassis 24.
Furthermore, a spring 48 is connected between the bent portion 46 of the
slide plate 50 and a projecting portion 47 of the chassis 24, which is
formed by cutting and bending. The spring 48 urges the slide plate 50 in
the direction of unlocking the floating base 21 (the direction indicated
by the arrow I in FIG. 19). Accordingly, the slide plates 37 and 50 are
respectively urged in the directions of locking and unlocking the floating
base 21, i.e., in opposite directions.
Referring now to FIG. 26, it illustrates a graph showing a load imposed on
the rotary cam 55 when locking and unlocking the floating base 21. When
locking the floating base 21, a load imposed on the link 95 due to the
spring 48 is decreased as the slide plate 50 slides. On the other hand, a
load imposed on the link 84 due to the spring 45 is increased as the slide
plate 37 slides. When unlocking the floating base 21, a load imposed on
the link 95 due to the spring 48 is increased as the slide plate 50
slides. On the other hand, a load imposed on the link 84 due to the spring
45 is decreased as the slide plate 37 slides.
Thus, the driving force required for the rotary cam 55 to drive the pair of
the slide plates 37 and 50 when locking the floating base 21 can be the
same as that required for the rotary cam 55 when unlocking the floating
base 21. That is, the driving force required for the rotary cam 55 to
drive the pair of slide plates can be nearly constant. As a result, the
pins 85 and 96 can slide smoothly within the grooves 86 and 97 of the
rotary cam 55. Furthermore, the maximum driving force required of the
power motor 56 can be reduced.
As shown in FIGS. 24 and 25, an L-shaped groove is formed on the slide
plate 50, and a pin engaged with the groove is fixed on the locking arm
49. The locking arm 49 rotates about an axis thereof as-the slide plate 50
slides on the chassis 24.
Referring now to FIG. 27, it illustrates a general top view showing the
disc device in the state wherein the floating base 21 is unlocked and the
holder 7 is moved downward to the floating base 21. Furthermore, FIG. 28
shows a left side view of the disc device when viewed from the direction
indicated by the arrow L in FIG. 27, FIG. 29 shows a partially cutaway
view showing the inside of the chassis shown in FIG. 28, and FIG. 30 shows
a left side view of the disc device when viewed from the direction
indicated by the arrow R in FIG. 27. When the slide plate 37 slides in the
direction indicated by the arrow G with respect to the chassis 24, as
shown in FIGS. 28 and 29, the engagement between an inclined portions 37a
of the slide plate 37 and the inclined portion 2a of the side arm 2 is
released and hence the holder 7 descends toward the floating base 21.
Furthermore, the pins 3, 94, 23, and 99 are unlocked and then the floating
base 21 changes into the floating state.
Next, a description will be made as to the pickup moving mechanism. FIG. 31
shows a bottom view showing the pickup mounted in the floating base 21,
and FIG. 32 shows a side view of the floating base 21 of FIG. 31. A turn
table 60 is disposed in the vicinity of the center of the floating base
21. The turn table 60 which is adapted to support and turn the disc within
a disc cartridge inserted into the holder is driven and rotated by a motor
61 disposed on the bottom surface of the floating base 21. The pickup 59
is disposed within a cutaway portion 21a of the floating base 21. The
pickup 59 is slidably supported by guide shafts 62 and 63 and is provided
with a guide portion 64 engaged with the threads of a shaft 66 which can
be rotated by a motor 65 disposed as a driving source. As the shaft 66
rotates, the guide portion 64 moves on the shaft 66. Thus, the pickup 59
moves forward or backward in the radial direction of the disc loaded on
the turn table 60.
Next, a description will be made as to the power motor peripheral
mechanism. FIG. 33 shows a plan view showing peripheral components of the
power motor 56 for rotating the rotary cam 55. A worm gear 57 pressed into
the power motor 56 which is placed on a motor base 54 fixed on the chassis
24 is engaged with the rotary cam 55 at the final stage by way of
reduction gears 58a, 58b, 58c, and 58d. That is, the driving force of the
power motor 56 is transmitted to the reduction gears 58a, 58b, 58c, and
58d through the worm gear 57 and finally to the rotary cam 55. Then, the
rotary cam 55 to which the driving force is transmitted rotates about the
axis 77, and this results in causing the pin 78 to slide along the driving
groove 79 formed by the ejector arm 9 and spacer arm 25, as shown in FIG.
5. Furthermore, the rotary cam 55 is adapted to cause the pins 85 and 96
to slide along the grooves 86 and 97 formed on the rotary cam 55, as shown
in FIG. 16.
Next, the description will be directed to the operation of each of the
aforementioned mechanisms of the disc device. When the user inserts a disc
cartridge into the disc device, usually, the pair of the bent portions 69a
of the pair of slider hooks 69 are engaged with a corresponding pair of
grooves of the disc cartridge. Thus, the disc cartridge is set in the
slider 14 slidably disposed within the holder 7. In such a state wherein a
disc cartridge inserted into the disc device has not been carried yet, the
pin 20 of the ejector arm 9 is in contact with the inner wall of the
groove 10 of the slider 14, as shown in FIG. 5. In this case, the slider
14 is urged in the direction indicated by the arrow U by the twisting
reversal spring 67 so as to abut on a side wall of the holder 7 in the
vicinity of the insertion opening. Thus, the rattle of the slider 14 can
be prevented.
The holder 7 is in alignment as shown in FIG. 2b with the floating base 21
between the instant when a disc cartridge is inserted and the instant when
the disc cartridge is carried to the replay position. If the upper portion
7b of the holder 7 in this alignment is pushed down, there is a
possibility that a disc cartridge cannot be inserted into the holder 7. In
order to prevent this malfunction, the disc cartridge inserting and
discharging mechanism is so constructed that a force exerted on the upper
portion is transmitted to the holder arm 1 combined with the holder 7 when
the upper portion 7b is pushed down, and then the holder 7 rotates about
the pins 3 and 23 disposed as the rotational axis of the holder 7 in a
cartridge loading direction (the direction indicated by the arrow N in
FIG. 2b). The downward movement of the holder causes the projecting
portion 5 of the holder arm 1 to bend the spring 6, the arm portion 6a of
which is engaged with the projecting portion 4 of the side arm 2, in the
clockwise direction against the elastic force of the arm portion 6b. As a
result, the disc cartridge inserting and discharging mechanism becomes a
state as shown in FIG. 34. In other words, the side arm 2 and holder arm 1
are adapted to absorb a pushing force exerted on the upper portion 7a.
Next, a description will be made as to a mechanism for preventing the
slider 14 from coming into contact with the turn table 60 and pickup 59
between the instant when a disc cartridge is inserted and the instant when
the cartridge is carried to the replay position. FIG. 35 shows a side view
showing the holder 7, slider 14, and floating base 21 when viewed from the
upper side of FIG. 5. The slider 14 is provided with a pair of protrusions
14a projecting toward the floating base 21. When a force in the direction
indicated by the arrow K in FIG. 35 is exerted on the holder 7, first the
pair of projecting portions 14a are brought into contact with the upper
surface of the floating base 21. Thus, the lower surface of the slider 14
is not brought into contact with the turn table 60, pickup 59, and so on.
Accordingly, the occurrence of failures of the turn table 60 and pickup 59
due to a collision between them and the slider 14 can be prevented.
Alternatively, as shown in FIG. 36, the pair of slider hooks 69 can be
provided with a pair of protrusions 69e, respectively. Like the
above-mentioned case, the occurrence of failures of the turn table 60 and
pickup 59 due to a collision between them and the slider 14 can be
prevented.
As previously mentioned, when a disc cartridge is inserted into the holder
7, the pair of guide holes of the disc cartridge are respectively engaged
with the pair of bent portions 69a of the pair of slider hooks 69 fixed on
the slider 14, as shown in FIG. 5. After that, when the user further
pushes the disc cartridge, the slider 14 is pushed forward by the disc
cartridge and slides along the guide grooves 18 and 19 of the holder 7. As
the slider 14 slides, the ejector arm 9 rotates about the axis 26 so that
the pin 20 disposed at one end part of the ejector arm 9 moves within the
groove 10 of the slider 14 in the direction indicated by the arrow E in
FIG. 5. The rotation of the ejector arm 9 causes the end portion 31 of the
ejector arm 9 as shown in FIG. 10 to dissociate itself from the switch 32.
As a result, the contact between the end part 31 and the switch 32 is
released and hence the switch 32 is switched on.
When the switch 32 is turned on, the power motor 56 is activated and then
the rotary cam 55 rotates in the clockwise direction (the direction
indicated by the arrow V in FIG. 5) by virtue of the rotational force of
the power motor 56. Thus, the pin 78 rotates about the axis 77 and the
ejector arm 9 rotates in the counterclockwise direction, so that the
slider 14 further slides within the holder 7. As a result, the disc
cartridge carried by the slider 14 moves toward the back of the holder 7.
As the disc cartridge moves, the shutter opener 11 moves together with the
cartridge. Then, as shown in FIG. 6, when the end part 8a of the hook 8 of
the shutter opener 11 is brought into contact with a side wall 73a of the
hole 73 of the holder 7, the sliding movement of the shutter opener 11 is
stopped. After that, as the disc cartridge further moves toward the back
of the holder, the hook 8 of the shutter opener 11 relatively slides along
the guide groove of the disc cartridge inserted. As a result, the end part
8a of the hook 8 is engaged with the shutter of the disc cartridge and the
shutter is opened.
Since the shutter opener 11 slides on the holder 7 in this manner, the
travel of the disc cartridge with respect to the holder 7 can be increased
by the travel of the shutter opener 11. That is, the disc cartridge can
move through not only the sliding stroke of the shutter thereof but also
the travel of the shutter opener 11, with respect to the hook 8 of the
shutter opener 11. Therefore, the carrying start position of a disc
cartridge inserted into the holder 7 (i.e. the position where the pair of
guide holes of the disc cartridge inserted are engaged with the pair of
slider hooks 69) can be moved closer to the insertion opening of the
holder 7. Accordingly, the needed travel through which the user has to
move a disc cartridge when inserting it into the holder can be reduced. In
other words, the length of a part of a disc cartridge projecting out of
the insertion opening when the disc cartridge is ejected from the holder
can be increased. Thus, the user can easily insert a disc cartridge into
the disc device and can easily take out a disc cartridge when it is
ejected from the disc device.
As shown in FIG. 6, when the pin 15 for slidably securing the slider 14 to
the holder 7 comes into contact with an end part 18a (see FIG. 5) of the
guide groove 18, the sliding movement of the slider 14 is stopped. After
that, as the rotary cam 55 further rotates in the clockwise direction, the
links 84 and 95 as shown in FIG. 16 rotates. As a result, as shown in
FIGS. 28 through 30, the pair of slide plates 37 and 50 move in the
directions indicated by the arrows G and I, respectively, and then the
engagement of the inclined portion 37a with the inclined portion 2a of the
side arm 2 is released. On the other hand, as shown in FIG. 37, the holder
7 is, together with the holder arm 1, pushed toward the floating base 21
by the urging force of a spring 82 connected between a projecting portion
80, which is formed by cutting and bending, of the holder arm 1 and a
projecting portion 81, which is formed by cutting and bending, of the
floating base 21. Thus, when the engagement of the inclined portion 37a
with the inclined portion 2a of the side arm 2 is released, the spring 82
engaged between the holder arm 1 and the floating base 21 causes the
holder arm 1 to rotate about the pin 3, 23 in the direction indicated by
the arrow A2 in FIG. 2b, i.e., toward the floating base, and hence the
projecting portion 7a of the holder 7 engaged with the circle-shaped notch
1d of the holder arm 1 is moved toward the floating base 21. As a result,
the holder 7 descends toward the floating base 21. The spring 82 also
serves to prevent the rattle of the holder 7 regardless of whether the
floating base 21 is locked or not.
After the engagement of the inclined portion 37a of the slide plate 37 with
the inclined portion 2a of the side arm 2 is released and then the holder
7 descends toward the floating base 21, the rotary cam 55 further rotates
in the clockwise direction together with the pin 78. Thus, the pin 78
moves within the groove 79 formed by the ejector arm 9 and spacer arm 25
while rotating. As a result, as shown in FIG. 7, the ejector arm 9 and
slider 14 are separated from each other. During the above movement, the
pair of slide plates 37 and 50 further slide on the chassis 24 so that the
floating base 21 is unlocked. Thus, the floating base 21 becomes a
vibration-proof state in which it is supported by the elastic members and
loading the disc cartridge on the floating base is finished. At the
completion of loading the disc cartridge, since the ejector arm 9 is
sufficiently away from the floating base 21, the ejector arm 9 never comes
into collision with the floating base 21 or slider 14 even if the floating
base 21 undergoes displacement with respect to the chassis 24 due to
vibrations or the like caused by a vehicle equipped with the disc device
according to the present invention.
As shown in FIG. 30, when the slide plate 50 slides and then a projecting
plate 50a of the slide plate pushes a stop switch 102, the stop switch 102
is switched on and then the power motor 56 is stopped. The loading
operation is thus completed.
Next, a description will be made as to disc cartridge discharging
operation. The disc cartridge discharging operation is started by the push
of an eject button by the user. When the eject button is pushed, the power
motor 56 begins to rotate opposite to the direction of inserting a disc
cartridge into the holder and hence the rotary cam 55 begins to rotate in
the counterclockwise direction. The following disc cartridge discharging
operation can be carried out by reversing the above-mentioned disc
cartridge inserting operation.
Referring now to FIGS. 38 and 39, they illustrate a plan view of a variant
of the slider and an enlarged view of the slider, respectively. As shown
in these figures, one of the pair of the slider hooks 69 each constructed
of an elastic body such as a flat spring is provided with a bent portion
69b recessed on the slider hook, which constructs a part of the wall
surrounding the groove portion 10 of the slider 14, as shown in FIG. 39.
The bent portion 69b realizes a safety mechanism as described hereinafter.
After the eject button is pushed and then the rotary cam 55 starts
rotating in the counterclockwise direction indicated by the arrow CV in
FIG. 38, the pin 20 is caught by the groove portion 10 and an ejecting
function is performed as shown in FIG. 6 in a normal condition. If a
position of the slider 14 has slipped to an ejecting direction when the
ejecting function starts, it is impossible for the pin 20 to be caught by
the groove portion 10 since the pin 20 positions outside the groove
portion 10 as shown in FIG. 40. Here, it is impossible for the slider 14
to move to an inverse ejecting direction since an end portion of the guide
groove 18 and the pin 15 are in contact with each other.
If the ejecting function starts under the condition, the ejecting function
is completed since the pin 20 can push the groove portion 10 and slide
outside the groove portion 10. However, if a loading function is intended
to start again, the loading function is not completed since the pin is not
caught by the groove portion 10. Thus, an error function occurs. In order
to recover a normal condition, the bent portion 69b is provided with.
When the rotary cam 55 rotates in CV direction, the pin 20 of the ejector
arm 9 comes into contact with the above-mentioned slider hook 69 and then
slides on the slider hook 69 toward the recessed portion 69b. In this
case, the pin 20 of the ejector arm 9 cannot move without being engaged in
the groove portion 10 of the slider 14. As shown in FIG. 40, when the
rotary cam 55 further rotates, the pin 20 comes into contact with the bent
portion 69b of the slider hook 69 which is disposed so as to cover an
opening of the groove portion 10. Then, the bent portion 69b is pushed and
is then bent in the direction indicated by the arrow F. As a result, the
opening is opened and then the pin 20 enters into the groove portion 10
through the opening. The pin 20 is thus engaged in the groove 10 of the
slider 14, as shown in FIG. 41.
Referring now to FIGS. 42 and 43, they illustrate a plan view of another
variant of the slider and an enlarged view of the slider, respectively. As
shown in these figures, one of the pair of slider hooks 69 is further
provided with a guide portion 69c in addition to the bent portion 69b.
Accordingly, when a disc cartridge is discharged out of the holder, the
pin 20 can easily come into contact with the bent portion 69b and then can
be engaged in the groove 10 easily because the pin 20 is guided by the
guide portion 69c.
Next, a description will be made as to locking and unlocking operation of
the floating base 21. In a state wherein the floating base 21 is locked,
as shown in FIGS. 16 through 19, when the rotary cam 55 rotates in the
clockwise direction, the pin 85 of the link 84 moves along the groove 86
of the rotary cam 55. As a result, the link 84 rotates about the axis 87
disposed as a supporting axis and hence the slide plate 37 engaged with
the end part 88 moves in the direction indicated by the arrow G in FIG.
16. The movement of the slide plate causes the protrusion 90 to move along
the cam groove 89 formed in the slide plate 37, with result that the
locking arm 35 rotates in the direction indicated by the arrow H in FIG.
18. The movements of the slide plate 37 and locking arm 35 cause the
locking grooves 91 and 92 of the slide plate 37 to dissociate themselves
from the pins 3 and 94 of the floating base 21. Finally, the pins 3 and 94
are unlocked.
As the pin 96 of the link 95 moves along the groove 97 of the rotary cam 55
in synchronization with the link 84, the link 95 rotates about the axis
150 disposed as a supporting axis. As a result, the slide plate 50 engaged
with the end part 151 of the link 95 moves in the direction indicated by
the arrow I in FIG. 19 and the locking arm 49 rotates in the direction
indicated by the arrow J in FIG. 19. The movements of the slide plate 50
and locking arm 49 cause the locking grooves 100 and 101 of the slide
plate 50 to dissociate themselves from the pins 98 and 99 of the floating
base 21. Finally, the pins 98 and 99 are unlocked.
As previously mentioned, since the springs 45 and 48 urge the slide plates
in opposite directions, i.e., in the directions of locking and unlocking
the floating base, respectively, the driving force required for unlocking
the floating base can be the same as that required for locking the
floating base. The operation of locking the floating base can be
accomplished by reversing the above-mentioned unlocking operation.
Referring now to FIGS. 44 and 45, they illustrate a rear view partially
showing the slider of a disc device according to a second embodiment of
the present invention, and a plan view partially showing the slider,
respectively.
In the second embodiment, the mechanism for facilitating the engagement of
the pin 20 of the ejector arm 9 with the groove portion 10 of the slider
14 in order to prevent the pin 20 of the ejector arm 9 from moving without
being engaged in the groove portion 10 of the slider 14 differs from that
according to the first embodiment. In FIGS. 44 and 45, the same parts as
those of the first embodiment are designated by the same reference
numerals. Furthermore, the description about the same parts will be
omitted.
A spring 201 is engaged between a projecting portion 69d, which is formed
by cutting and bending, of the slider hook 69 and a projecting portion
202a, which is formed by cutting and bending, of a slide plate 202. The
slide plate 202 is slidably disposed within the groove portion 10 of the
slider 14 and is urged toward the slider hook 69 by the spring 201. After
the eject button is pushed and the rotary cam 55 starts rotating in the
counterclockwise direction indicated by the arrow CV in FIG. 38, the pin
20 of the ejector arm 9 comes into contact with the above-mentioned slider
hook 69 and then moves toward a guide portion 202b projecting from the
slide plate 202. When the rotary cam 55 further rotates, the pin 20 comes
into contact with the guide portion 202b of the slide plate 202 and then
the slide plate 202 slides so as to generate an opening 200, as shown in
FIG. 45. The pin 20 enters into the groove portion 10 through the opening
200 and is then engaged in the groove portion 10. The pin 20 of the
ejector arm 9 is thus prevented from moving without being engaged in the
groove portion 10 of the slider 14. After the pin 20 is engaged in the
groove portion 10, the slide plate 202 returns to its original position by
the spring 201 and hence the opening 200 is closed.
Referring now to FIGS. 46, 47, 48, and 49, they illustrate a general plan
view of a disc device according to a third embodiment of the present
invention, a left side view of the disc device when viewed from the
direction indicated by the arrow L in FIG. 46, a right side view of the
disc device when viewed from the direction indicated by the arrow R in
FIG. 46, and a partially cutaway view of FIG. 48. Furthermore, FIG. 50
shows a plan view showing slide plates 203 and 205 and a link plate 204
which are integral parts of the floating base locking mechanism according
to this embodiment, FIG. 51 shows an elevational view of the slide plate
203, FIG. 52 shows an elevational view of the link plate 204, and FIG. 53
shows an elevational view of the slide plate 205. In the third embodiment,
the floating base locking mechanism partially differs from that according
to the first embodiment. In FIGS. 46 through 53, the same parts as those
of the first embodiment are designated by the same reference numerals.
Furthermore, the description about the same parts will be omitted.
In accordance with this embodiment, the driving link 95 is connected with
the slide plate 203 which can lock the locking pin 99, instead of the
slide plate 50 according to the first embodiment mentioned above, as shown
in FIG. 46. As shown in FIG. 51, the slide plate 203 is provided with a
groove 210 which is engaged with a pin 211 of the link plate 204. As shown
in FIG. 53, the slide plate 205 is provided with a groove 212 which is
engaged with a pin 213 of the link plate 204. The slide plates 203 and 205
are slidably attached on the chassis 24 and the link plate 204 is disposed
so as to rotate about an axis 214 fixed on the chassis 24. When the slide
plate 203 slides as the link 95 rotates, the slide plate 205 which can
lock the other locking pin 23 slides opposite in direction to the travel
of the slide plate 203 through the link plate 204.
Furthermore, as shown in FIG. 49, a spring 206, one end of which is
connected with the chassis 24 and the other end of which is connected with
the slide plate 205, urges the slide plate 205 which is at the longest
distance from the driving link 95 in the direction indicated by the arrow
M in the figure. Thus, the rattle and chatter of the driving link 95,
slide plate 203, link plate 204, and slide plate 205 can be prevented.
As previously mentioned, the present invention offers the following
advantages.
In accordance with the above-mentioned embodiments, a rotary cam is
rotatably disposed on a chassis for driving members for locking a floating
base and for driving a driving arm engaged with a slider in order to
insert a disc cartridge into a holder or discharge the disc cartridge out
of the holder, and the driving arm is adapted to dissociate itself from
the slider when the disc cartridge held in the holder moves up and down
and when writing to or replaying the disc cartridge. Thus, when writing to
or replaying the disc cartridge, the floating base can be in a
vibration-proof state wherein it is supported by only a plurality of
elastic members. Furthermore, since the driving arm does not come into
contact with the floating base during replaying or writing to the disc
cartridge, vibrations are not created in the floating base.
Since the width of a driving gap between the driving arm and a space arm in
the vicinity of the end-of-travel point of a pin disposed on end part of
the rotary cam is narrower than the size of the pin and the pin is
securely held by the arms due to the urging force of a spring connected
between the arms, the rattle and chatter of the arms can be prevented.
Furthermore, the rotary cam is provided with grooves engaged with the pins
of a pair of links which drive a pair of slide plates for locking the
floating base. This results in preventing the pair of slide plates from
moving out of synchronization with each other. Accordingly, the locking
and unlocking operations of the floating base can be carried out smoothly.
In addition, there are provided a spring which urges one of the pair of
slide plates and another spring which urges the other of the pair of slide
plates in the opposite direction. Therefore, variations in the driving
force required for causing the slide plates to slide can be reduced
regardless of whether the pair of slide plates slide in the locking
direction or in the unlocking direction. As a result, the pair of slide
plates can slide smoothly, and the needed driving force can be decreased.
Furthermore, in accordance with one embodiment of the present invention,
one of the pair of slide plates is constructed by two plates which can
slide in opposite directions in synchronization with each other by means
of a link plate, and two pins disposed on one side surface of the floating
base are locked by the two plates which have slid in opposite directions.
Thus, the lock of the floating base can be ensured.
In addition, there are provided a lug for preventing wrong insertion of a
cartridge, a switch lever which is pivotably attached on the holder and is
located behind and outside the end part of the lug, when viewed from an
insertion opening through which a disc cartridge is inserted, so that a
projecting portion thereof is brought into contact with a corner of the
disc cartridge inserted correctly, and a switch which is able to detect
correct insertion of a disc cartridge when the switch arm rotates.
Therefore, since, when the switch detects wrong insertion of a disc
cartridge, the disc cartridge is not carried, failures due to wrong
insertion can be prevented.
Furthermore, there is provided a shutter opener having a protrusion which
can open the shutter of a disc cartridge, the shutter opener being
supported on the holder so that the shutter opener can slide in the
directions of inserting and discharging a disc cartridge into and out of
the holder. Therefore, the travel of the disc cartridge with respect to
the holder can be increased by the travel of the shutter opener. The
length of a part of the disc cartridge projecting out of the holder when
the cartridge is ejected from the holder can be increased. Thus, the user
can easily take out the disc cartridge when it is ejected from the disc
device.
In addition, a holder arm is rotatably attached on the floating base and
the holder is mounted on the holder arm in such a manner that the holder
can rotate with respect to the holder arm. Therefore, the holder can
smoothly move downwards and upwards to and from the floating base.
Furthermore, the holder arm is provided with a pair of circle-shaped
notches, the opening of each of which is not directed toward the cartridge
insertion opening of the holder, and the holder is provided with a pair of
projecting portions each projecting therefrom in a nearly horizontal
direction. The cross section of each of the pair of projecting portions is
shaped such that the thickness of the longitudinal side is larger than
that of the opening of the circle-shaped notch and the thickness of the
other side is smaller than that of the opening of the circle-shaped notch.
Therefore, the assembly of the holder and holder arm can be easily carried
out by inserting the pair of projecting portions into the pair of
circle-shaped notches in such a manner that the thinner side of each of
the projecting portions is fitted into the opening of each of the
circle-shaped notches, and then rotating the holder so that the thicker
side of each of the projecting portions is engaged in each of the notch
portions. Thus, the pair of projecting portions of the holder do not fall
off the pair of notch portions of the holder arm.
In addition, when the floating base is locked, a side arm is brought into
contact with the slide plate and is therefore secured. Furthermore, the
holder arm is rotatably engaged with the side arm by a spring. Therefore,
when a disc cartridge is inserted into the holder in a slanting direction
which deviates upwards or downwards from a horizontal direction, the
holder is tilted upwards or downwards. This results in preventing the
holder from distorting.
Furthermore, there is provided a pair of protrusions disposed on either the
slider or the pair of slider hooks, the protrusions projecting toward the
floating base. Therefore, only the protrusions projecting the slider abuts
on the floating base even if the holder moves downward when a disc
cartridge is inserted in a slanting direction toward the floating base.
This results in preventing the slider from coming into contact with the
turn table and optical pickup.
In addition, there is provided an opening formed in a side wall surrounding
the groove portion of the slider engaged with the driving arm, and an
elastic member which covers the opening. When the driving arm moves in the
direction of discharging a disc cartridge inserted, a pin disposed at one
end part of the driving arm comes into contact with the elastic member and
hence the elastic member is pushed and bent. Then, the opening is opened
and the pin of the driving arm enters into the groove portion. After that,
the opening is closed and the driving arm is securely engaged in the
groove portion. Thus, since the pin of the driving arm is securely
accommodated within the groove portion, there is not a case where the
driving arm is not engaged with the groove portion of the slider and hence
the slider cannot move when inserting a disc cartridge.
Furthermore, there is provided a guide protrusion in the vicinity of the
opening of the groove portion of the slider. When discharging a disc
cartridge inserted, the pin of the driving arm is guided by the guide
protrusion and hence is easily brought into contact with the elastic
member. Thus, the pin of the driving arm can be securely engaged in the
groove portion.
In addition, there can be provided a slide plate at the opening of the
groove portion of the slider instead of the elastic member, and a spring
which urges the slide plate so that the slide plate covers the opening.
When discharging a disc cartridge inserted, the pin of the driving arm is
brought into contact with a projecting portion of the slide plate and this
results in sliding the slide plate to open the opening. Thus, the pin of
the driving arm can be securely engaged in the groove portion.
As mentioned above, in accordance with the aforementioned embodiments,
various issues in bringing the disc device to the commercial stage, such
as simplification of mechanical components, reduction in component count,
improvement of assembly efficiency of mechanical components, and
downsizing the disc device can be improved.
Many widely different embodiments of the present invention may be
constructed without departing from the spirit and scope of the present
invention. It should be understood that the present invention is not
limited to the specific embodiments described in the specification, except
as defined in the appended claims.
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